A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

Solve the following series:
AZ, GT, MN, __, YB

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

John Went to the nearby store in a Mall to buy something for her home. Below is the conversation between the two:

John: How much for the one?
Shopkeeper: It is $2
John: How much for the Eleven?
Shopkeeper: It is $4
John: How much for the Hundred?
Shopkeeper: It is $6.

What is John buying?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?